Modify footnote to allow multiple lines

Updated footnote syntax to include a second line.

Author: timothyhull

content/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax.md

@@ -400,7 +400,7 @@ Here is a simple footnote[^1].
 A footnote can also have multiple lines[^2].
 
 [^1]: My reference.
-[^2]: To add line breaks within a footnote, add 2 spaces to the end of a line.  <!-- This line has 2 spaces after the period -->
+[^2]: To add line breaks within a footnote, add 2 spaces to the end of a line.  
 This is a second line.
 ```